Question

extra credit 1

Write a program that will display the following menu and prompt the user for a selection:

A)   Add two numbers
B)   Subtract two numbers
C)   Multiply two numbers
D)   Divide two numbers
X)   Exit program

The program should:

• display a hello message before presenting the menu
• accept both lower-case and upper-case selections for each of the menu choices
• display an error message if an invalid selection was entered (e.g. user enters E)
• prompt user for two numbers if A, B, C, or D was entered
• if D entered, validate the second number is not zero
• perform selected calculation (+, -, *, /) and display results
• if X entered, display a goodbye message before exiting the program

Program output (what is displayed to the user) should be well-formatted (i.e. decimal places, if used, should be consistent), with descriptive text (e.g. The sum of 2 and 4 is 6), and "pleasing" to the eye (i. e. use blank lines or ============== to break up the presentation of the results).

============================================================================================================================================

extra credit 2

This extra-credit assignment

Modify the program written for Extra Credit #1 to continue prompting the user for a menu selection until the exit condition is entered. All other criteria from Extra Credit #1must still be met in Extra Credit #2.

Answer 1

#include<iostream>
using namespace std;
// add function that add two numbers
void add(){
   int num1,num2;
   cout << "Enter two numbers "<< endl;
   cout << "First :";
   cin >> num1;
   cout << "Second :";
   cin >>num2;
   int result=num1+num2;
   cout << "The sum of " << num1 << " and "<< num2 <<" is = "<< result;
   return;
}
// subtract function that subtract two numbers
void subtract(){
   int num1,num2;
   cout << "Enter two numbers "<< endl;
   cout << "First :";
   cin >> num1;
   cout << "Second :";
   cin >>num2;
   int result=num1-num2;
   cout << "The subtract of " << num1 << " and "<< num2 <<" is = "<< result;
   return;
}
// multiply function that multiply two numbers
void multiply(){
   int num1,num2;
   cout << "Enter two numbers "<< endl;
   cout << "First :";
   cin >> num1;
   cout << "Second :";
   cin >>num2;
   int result=num1*num2;
   cout << "The multipication of " << num1 << " and "<< num2 <<" is = "<< result;
   return;
}

// divide function that divide two numbers
void divide(){
   int num1,num2;
   cout << "Enter two numbers "<< endl;
   cout << "First :";
   cin >> num1;
   cout << "Second :";
   cin >>num2;
   if(num2 ==0){// check denominator is zero or not
       cout << "Denominator can not be zero. Please enter the valid denominator "<< endl;
       cin >> num2;// if zero then ask valid denominator from user
   }
   float result=num1/num2;
   cout << "The division of " << num1 << " and "<< num2 << " is = "<< result;
   return;
}
//main function
int main(){
   cout << "Hello" << endl;//hello message
   cout << "======================================================================="<<endl;
   cout << "Menu "<< endl;//menu
   cout << "======================================================================="<<endl;
   cout << "a/A To add two numbers "<< endl;
   cout << "b/B To subtract two numbers "<< endl;
   cout << "c/C To multiply two numbers "<< endl;
   cout << "d/D To divide two numbers "<< endl;
   cout << "x/X Exit "<< endl;
   cout << "======================================================================="<<endl;
   char ch;
   cin >> ch;// taking options from user
   switch(ch){
       case 'a' : add();
                   break;
        case 'A' : add();
                   break;
       case 'b' : subtract();
                   break;
        case 'B' : subtract();
                   break;
       case 'c' : multiply();
                   break;
        case 'C' : multiply();
                   break;              
       case 'd' : divide();
                   break;
        case 'D' : divide();
                   break;
       case 'x' : cout << "Good Bye " << endl;
                          return 0;
        case 'X' : cout << "Good Bye " << endl;
                          return 0;
       default: cout << "Error: Invalid option "<< endl;// if invalid options
   }
return 0;                          
}

#include<iostream>
using namespace std;
// add function that add two numbers
void add(){
   int num1,num2;
   cout << "Enter two numbers "<< endl;
   cout << "First :";
   cin >> num1;
   cout << "Second :";
   cin >>num2;
   int result=num1+num2;
   cout << "The sum of " << num1 << " and "<< num2 <<" is = "<< result<< endl;
   cout << "======================================================================="<<endl;
   return;
}
// subtract function that subtract two numbers
void subtract(){
   int num1,num2;
   cout << "Enter two numbers "<< endl;
   cout << "First :";
   cin >> num1;
   cout << "Second :";
   cin >>num2;
   int result=num1-num2;
   cout << "The subtract of " << num1 << " and "<< num2 <<" is = "<< result<< endl;
   cout << "======================================================================="<<endl;
   return;
}
// multiply function that multiply two numbers
void multiply(){
   int num1,num2;
   cout << "Enter two numbers "<< endl;
   cout << "First :";
   cin >> num1;
   cout << "Second :";
   cin >>num2;
   int result=num1*num2;
   cout << "The multipication of " << num1 << " and "<< num2 <<" is = "<< result<<endl;
   cout << "======================================================================="<<endl;
   return;
}

// divide function that divide two numbers
void divide(){
   int num1,num2;
   cout << "Enter two numbers "<< endl;
   cout << "First :";
   cin >> num1;
   cout << "Second :";
   cin >>num2;
   if(num2 ==0){// check denominator is zero or not
       cout << "Denominator can not be zero. Please enter the valid denominator "<< endl;
       cin >> num2;// if zero then ask valid denominator from user
   }
   float result=num1/num2;
   cout << "The division of " << num1 << " and "<< num2 << " is = "<< result<< endl;
   cout << "======================================================================="<<endl;
  
   return;
}
//main function
int main(){
   cout << "Hello" << endl;//hello message
   cout << "======================================================================="<<endl;
   cout << "Menu "<< endl;//menu
   cout << "======================================================================="<<endl;
   cout << "a/A To add two numbers "<< endl;
   cout << "b/B To subtract two numbers "<< endl;
   cout << "c/C To multiply two numbers "<< endl;
   cout << "d/D To divide two numbers "<< endl;
   cout << "x/X Exit "<< endl;
   cout << "======================================================================="<<endl;
  
   char ch;
   cin >> ch;// taking options from user
   while(ch!='x'||ch!='X'){
      
       switch(ch){
           case 'a' : add();
                       break;
            case 'A' : add();
                       break;
           case 'b' : subtract();
                       break;
            case 'B' : subtract();
                       break;
           case 'c' : multiply();
                       break;
            case 'C' : multiply();
                       break;              
           case 'd' : divide();
                       break;
            case 'D' : divide();
                       break;
           case 'x' : cout << "Good Bye " << endl;
                              return 0;
            case 'X' : cout << "Good Bye " << endl;
                              return 0;
           default: cout << "Error: Invalid option "<< endl;// if invalid options
       }
   cout << endl;
    cin >> ch;
}
return 0;                          
}